Initial JedisSentinelPool based on code from hamsterready/jedis-sentinel-pool.
Given a master name and a set of sentinels this pool will subscribe to the Sentinel notifications about master changes (+switch-master) and re-establishes the pool to the new master when one is announced.
This commit is contained in:
Hisham Mardam-Bey
203
src/main/java/redis/clients/jedis/JedisSentinelPool.java
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203
src/main/java/redis/clients/jedis/JedisSentinelPool.java
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package redis.clients.jedis;
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import java.util.Arrays;
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import java.util.List;
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import java.util.Set;
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import java.util.logging.Logger;
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import org.apache.commons.pool.impl.GenericObjectPool.Config;
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import redis.clients.jedis.exceptions.JedisConnectionException;
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import redis.clients.util.Pool;
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public class JedisSentinelPool extends Pool<Jedis> {
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protected Config poolConfig;
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protected int timeout = Protocol.DEFAULT_TIMEOUT;
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protected String password;
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protected int database = Protocol.DEFAULT_DATABASE;
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protected Logger log = Logger.getLogger(getClass().getName());
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public JedisSentinelPool(String masterName, Set<String> sentinels, final Config poolConfig) {
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this(masterName, sentinels, poolConfig, Protocol.DEFAULT_TIMEOUT, null, Protocol.DEFAULT_DATABASE);
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}
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public JedisSentinelPool(String masterName, Set<String> sentinels) {
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this(masterName, sentinels, new Config(), Protocol.DEFAULT_TIMEOUT, null, Protocol.DEFAULT_DATABASE);
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}
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public JedisSentinelPool(String masterName, Set<String> sentinels, final Config poolConfig, int timeout, final String password) {
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this(masterName, sentinels, poolConfig, timeout, password, Protocol.DEFAULT_DATABASE);
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}
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public JedisSentinelPool(String masterName, Set<String> sentinels, final Config poolConfig, final int timeout) {
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this(masterName, sentinels, poolConfig, timeout, null, Protocol.DEFAULT_DATABASE);
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}
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public JedisSentinelPool(String masterName, Set<String> sentinels, final Config poolConfig, int timeout, final String password,
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final int database) {
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this.poolConfig = poolConfig;
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HostAndPort master = initSentinels(sentinels, masterName);
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initPool(master);
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}
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public void returnBrokenResource(final BinaryJedis resource) {
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returnBrokenResourceObject(resource);
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}
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public void returnResource(final BinaryJedis resource) {
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returnResourceObject(resource);
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}
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private class HostAndPort {
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String host;
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int port;
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@Override
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public boolean equals(Object obj) {
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if (obj instanceof HostAndPort) {
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final HostAndPort that = (HostAndPort) obj;
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return this.port == that.port && this.host.equals(that.host);
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}
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return false;
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}
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@Override
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public String toString() {
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return host + ":" + port;
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}
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}
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public class JedisPubSubAdapter extends JedisPubSub {
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@Override
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public void onMessage(String channel, String message) {
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}
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@Override
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public void onPMessage(String pattern, String channel, String message) {
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}
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@Override
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public void onPSubscribe(String pattern, int subscribedChannels) {
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}
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@Override
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public void onPUnsubscribe(String pattern, int subscribedChannels) {
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}
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@Override
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public void onSubscribe(String channel, int subscribedChannels) {
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}
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@Override
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public void onUnsubscribe(String channel, int subscribedChannels) {
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}
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}
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private volatile HostAndPort currentHostMaster;
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public void destroy() {
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// FIXME clean Sentinel connections
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super.destroy();
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}
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public HostAndPort getCurrentHostMaster() {
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return currentHostMaster;
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}
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private void initPool(HostAndPort master) {
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if (!master.equals(currentHostMaster)) {
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currentHostMaster = master;
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log("Created pool: " + master);
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initPool(poolConfig, new JedisFactory(master.host, master.port, timeout, password, database));
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}
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}
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private HostAndPort initSentinels(Set<String> sentinels, final String masterName) {
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HostAndPort master = null;
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final boolean running = true;
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outer: while (running) {
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for (String sentinel : sentinels) {
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final HostAndPort hap = toHostAndPort(Arrays.asList(sentinel.split(":")));
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try {
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final Jedis jedis = new Jedis(hap.host, hap.port);
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if (master == null) {
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master = toHostAndPort(jedis.sentinelGetMasterAddrByName(masterName));
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jedis.disconnect();
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break outer;
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}
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} catch (JedisConnectionException e) {
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log("Cannot connect to sentinel running @ " + hap + ". Trying next one.");
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}
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}
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try {
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log("All sentinels down, cannot determinate where is " + masterName + " master is running... sleeping 1000ms.");
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Thread.sleep(1000);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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log("Got master running at " + master + ". Starting sentinel listeners.");
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for (String sentinel : sentinels) {
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final HostAndPort hap = toHostAndPort(Arrays.asList(sentinel.split(":")));
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new Thread() {
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public void run() {
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boolean running = true;
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while (running) {
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final Jedis jedis = new Jedis(hap.host, hap.port);
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try {
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jedis.subscribe(new JedisPubSubAdapter() {
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@Override
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public void onMessage(String channel, String message) {
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// System.out.println(channel + ": " + message);
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// +switch-master: mymaster 127.0.0.1 6379 127.0.0.1 6380
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log("Sentinel " + hap + " published: " + message + ".");
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final String[] switchMasterMsg = message.split(" ");
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if (masterName.equals(switchMasterMsg[0])) {
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initPool(toHostAndPort(Arrays.asList(switchMasterMsg[3], switchMasterMsg[4])));
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}
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}
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}, "+switch-master");
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} catch (JedisConnectionException e) {
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log("Lost connection to " + hap + ". Sleeping 5000ms.");
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try {
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Thread.sleep(5000);
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} catch (InterruptedException e1) {
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e1.printStackTrace();
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}
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}
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}
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};
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}.start();
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}
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return master;
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}
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// sophisticated logging
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private void log(String msg) {
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log.info(msg);
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}
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private HostAndPort toHostAndPort(List<String> getMasterAddrByNameResult) {
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final HostAndPort hap = new HostAndPort();
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hap.host = getMasterAddrByNameResult.get(0);
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hap.port = Integer.parseInt(getMasterAddrByNameResult.get(1));
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return hap;
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}
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}
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